minor changes in PCB regarding notification behaviour

android/Pictogram/commonlibrary/src/main/java/com/yottacode/pictogram/net/NetService.java

@@ -94,7 +94,10 @@ public class NetService implements Runnable {
     }
     public boolean online() {return updated;}
 
-    public void restart_app() {this.device.restart_app();}
+    public void restart_app() {
+      PCBcontext.unset_user();
+      this.device.restart_app();
+    }
 
     /**
      * ping to the server by using a restapi call. If ok, the call will return the empty set

android/Pictogram/commonlibrary/src/main/java/com/yottacode/pictogram/tools/PCBcontext.java

@@ -69,6 +69,14 @@ public  final class PCBcontext {
         getNetService().notifyStatus();
     }
 
+  public static void unset_user() {
+    pcbdb = null;
+    if (room!=null)  room.exit();
+    room = null;
+    vocabulary = null;
+    getNetService().notifyStatus();
+  }
+
   /**
    *
    * @return true if a given user has been logged into the system (the login window was successfully filled)

android/Pictogram/tablet/src/main/java/com/yottacode/pictogram/tablet/gui/PictogramActivity.java

@@ -737,8 +737,10 @@ public class PictogramActivity extends Activity implements iVocabularyListener,
         public boolean onLongClick(View v) {
             count_deletelong++;
 
-            if (count_deletelong >= 3)
-                PCBcontext.getNetService().restart_app();
+            if (count_deletelong >= 3) {
+              PictogramActivity.this.finish();
+              PCBcontext.getNetService().restart_app();
+            }
             return false;
         }
     }